A cedilla (/sɨˈdɪlə/si-DIL-ə; from Spanish), also known as cedilha (from Portuguese) or cédille (from French), is a hook or tail ( ¸ ) added under certain letters as a diacritical mark to modify their pronunciation. In Catalan, Portuguese and in French, it is used only under the c, and the entire letter is called respectively c trencada (i.e. "broken C"), "c cedilhado" and "c cédille".

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The tail originated in Spain as the bottom half of a miniature cursivez. The word “cedilla” is the diminutive of the Old Spanish name for this letter, ceda (zeta).[1] Modern Spanish or modern Galician, however, no longer use this diacritic, although it is still current in Portuguese,[2]Catalan, Occitan, and French, which gives English the alternative spellings of cedille, from French “cédille”, and the Portuguese form cedilha. An obsolete spelling of cedilla is cerilla.[2] The earliest use in English cited by the Oxford English Dictionary[2] is a 1599 Spanish-English dictionary and grammar.[3] Chambers’ Cyclopædia[4] is cited for the printer-trade variant ceceril in use in 1738.[2] The main use in English is not universal and applies to loan words from French and Portuguese such as “façade”, “limaçon” and “cachaça” (often typed “facade”, “limacon” and “cachaca” because of lack of ç keys on Anglophone keyboards).

The most frequent character with cedilla is "ç" ("c" with cedilla, as in façade). It was first used for the sound of the voiceless alveolar affricate/ts/ in old Spanish and stems from the Visigothic form of the letter "z" (ʒ), whose upper loop was lengthened and reinterpreted as a "c", whereas its lower loop became the diminished appendage, the cedilla.

It represents the "soft" sound /s/, the voiceless alveolar sibilant, where a "c" would normally represent the "hard" sound /k/ (before "a", "o", "u", or at the end of a word) in English and in certain Romance languages such as Catalan, Galician, French, Ligurian, Occitan, and Portuguese. In Occitan, Friulian and Catalan ç can also be found at the beginning of a word (Çubran, ço) or at the end (braç).

The character "ş" represents the voiceless postalveolar fricative/ʃ/ (as in "show") in several languages. It sounds the same as the Slavic Š. It is used in several languages, including many belonging to the Turkic languages, and included as a separate letter in their alphabets:

Comparatively, some consider the diacritics on the Latvian consonants "ģ", "ķ", "ļ", "ņ", and formerly "ŗ" to be cedillas. Although their Adobeglyph names are commas, their names in the Unicode Standard are "g", "k", "l", "n", and "r" with a cedilla. The letters were introduced to the Unicode standard before 1992, and their names cannot be altered. The uppercase equivalent "Ģ" sometimes has a regular cedilla.

As of 2011[update], many font rendering engines do not display any of these properly, for two reasons:

"ļ" and "ņ" usually do not display properly at all, because of the use of the cedilla in Latvian. Unicode has precombined glyphs for these letters, but most quality fonts display them with comma below diacritics to accommodate the expectations of Latvian orthography. This is considered nonstandard in Marshallese. The use of a zero-width non-joiner between the letter and the diacritic can alleviate this problem: "l‌̧" and "n‌̧" may display properly, but may not; see below.

"m̧" and "o̧" do not currently exist in Unicode as precombined glyphs, and must be encoded as the plain Latin letters "m" and "o" with the combining cedilla diacritic. Most Unicode fonts issued with Windows do not display combining diacritics properly, showing them too far to the right of the letter, as with Tahoma ("m̧" and "o̧") and Times New Roman ("m̧" and "o̧"). This mostly affects "m̧", and may or may not affect "o̧". But some common Unicode fonts like Arial Unicode MS ("m̧" and "o̧"), Cambria ("m̧" and "o̧") and Lucida Sans Unicode ("m̧" and "o̧") don't have this problem. When "m̧" is properly displayed, the cedilla is either underneath the center of the letter, or is underneath the right-most leg of the letter, but is always directly underneath the letter wherever it is positioned.

Languages such as Romanian add a comma (virgula) to some letters, such as ș, which looks like a cedilla, but is more precisely a diacritical comma. This is particularly confusing with letters which can take either diacritic: for example, the consonant /ʃ/ is written as "ş" in Turkish but "ș" in Romanian, and Romanian writers will sometimes use the former instead of the latter because of insufficient font or character-set support.

The Polish letters "ą" and "ę" and Lithuanian letters "ą", "ę", "į", and "ų" are not made with the cedilla either, but with the unrelated ogonek diacritic.

In 1868, Ambroise Firmin-Didot suggested in his book Observations sur l'orthographe, ou ortografie, française (Observations on French Spelling) that French phonetics could be better regularized by adding a cedilla beneath the letter "t" in some words. For example, the suffix -tion this letter is usually not pronounced as (or close to) /t/ in either French or English, but respectively as /sjɔ̃/ and /ʃən/. It has to be distinctly learned that in words such as French diplomatie (but not diplomatique) and English action it is pronounced /s/ and /ʃ/, respectively (but not in active in either language). A similar effect occurs with other prefixes or within words also in French and English, such as partial where t is pronounced /s/ and /ʃ/ respectively. Firmin-Didot surmised that a new character could be added to French orthography. A similar letter, the t-comma, does exist in Romanian, but it has a comma accent, not a cedilla one.

The Unicode character for Ţ (T with cedilla) and Ş (S with cedilla) were wrongly implemented in Windows for the Romanian language. In Windows 7, Microsoft corrected this error, replacing T-cedilla with T-comma (Ț) and S-cedilla with S-comma (Ș).